Apparatus for making molds for twisted articles



(No Model.)

G. P. STEARNS.

APPARATUS FOR MAKING MOLDS FOR TWISTED ARTIGLES. No. 356,430. Patented Jan. 18, 1887;

1 I FF GEORGE F. STEARNS, OF CHESTER, ASSIGNOR OF ONE-HALF TO RICHARD J. ALLYN, OF HARTFORD, CONNECTICUT.

APPARATUS FOR MAKING MOLDS FOR TWISTED ARTICLES.

SPECIFICATION forming part of Letters Patent No. 35?,430, dated January 18, 1887.

Application filed August 9,1886. Serial No. 210,378. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE F. STEARNS, of Chester, in the county of Middlesex and State of Connecticut, have invented a new Im- -provement in Apparatus for Making Molds for Casting Twisted Articles; and I do hereby declare the following, when taken in connection with accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent. in.-

Figure 1, a top view of a pattern-board with the pattern attached, the shank portion of the pattern partly broken away to show the spindle; Fig. 2, a top view of the moldboard with the shank and head portions of the pattern fixed, but the twisted portion turned away to show the opening through the board; Fig. 3, a longitudinal central section showing the twisted portion of the pattern in side view; Fig. 4, a transverse section through the twisted portion.

This invention relates to an improvementin 2 5 apparatus for preparing molds for casting augers or articles of like twisted character.

In a properly formed twisted auger it is impossible to mold the twist portion in a twopart flask and draw the same from the flask without disturbing the sand to a greater or less extent.

Molds for articles of cylindrical character have been made by arranging a pattern composed of a half-cylinder on the mold-board over a corresponding opening, hung upon an axis so as to be rotated thereon, and so that the pattern, standing. above the plane of the board over the opening, and the sand tainped thereon, while the flask was yet on the moldboard, will be drawn from the sand by imparting to it a rotative movement uponits own axis to turn it from the sand down through the mold-board. While this is practical for articles of cylindrical character, in which all irregularities are annular-that is, allin parallel planes-in twisted articles such a rotation would only serve to detroy the mold.

The object of my invention is to apply the rotative method of drawing patterns from the 5o sand to the casting of twisted articles.

To that end the invention consists in apat tern corresponding to one-half the twist to be produced, the division bei'ngin alongitudinal central plane, combined with a -mold-board constructed with an opening through it corresponding to the plane of the division in the twisted pattern, the twisted pattern arranged upon an axis over said opening and in the plane of the surface of the board,whereby, as the pattern is revolved, the twist entering the opening in the board will receive therefrom a longitudinal movement according to its twist, and thereby be drawn from the sand according to its twist.

In illustrating my invention I show it as applied to the casting of angers.

A represents a moldboard for common snap-fiask molding; B, the body or twist portion of the pattern, which corresponds to onehalf the anger to be cast, as seen in Fig. 4.

In the mold-board an opening, C, is made, which corresponds to one-half the sectional plane of thetwisted portion of the pattern, as seen in Fig. 2-that is to say, the opening through the board corresponds to the spiral rib of the pattern. At one end of this opening a fixed block, D, is arranged, correspond ing to the metal required to be left for the head of the auger, and, as here represented, a

core-print, E, is also arranged in axial line with s the head part D. At the opposite end of the opening is a fixed portion, F, corresponding to the shank and tang of the auger. These parts D and F are rigidly fixed to the moldboard, and thetwist or body of the auger cor- 8 responds in length to the distance between the end of the shank portion F and the head D. The shank portion is madetubular, and through it is a longitudinal spindle, G, which extends beyond the end of the mold-board, and is there provided with a suitable handle, H, by which the spindle may be turned, the spindle being in the axial line of the pattern for the auger. The twist portion B is rigidly fixed to the spindle G, or made a part of it, and so that it will rotate with the spindle G. The opening C through the board stands directly under the twist portion on one side of the center. The other side lies fiat upon the surface of the board, and thus arranged, as seen in Fig. 1, the pattern is in condition for molding. The flask is placed upon the mold-board and the sand introduced and treated in the usual mannor for molding for other castings. As the spindle by which the pattern is to be rotated must extend outside the flask, it will be understood that a corresponding recess will be formed in the flask at the spindle end.

After the sand has been properly applied, the spindle G is rotated by means of the handle H, or otherwise, in the direction of the opening 0, and so that the convolntions of the twist pass down through the opening,and these openings corresponding in shape to the convolntions, it follows that in the rotation of the twist it would be guided by the opening and so as to advance in the openings according to the twist of the convolntions, and thus guided will be advanced and drawn from the mold in the exact path of their own convolntions, and thus leave the sand without disturbing itthat is to say, the pattern is substantially unscrewed from the mold and passes to a position substantially below the plane of the mold-hoard, as indicated in broken lines, Fig. 4, and free from the flask, when the flask is removed in the usual manner of removing flasks from such mold-boards.

The head and shank ends do not interfere with the removal of the flask. They therefore remain stationary. The division between the head and the twist portion is parallel with the convolutions of the twisted portion, as seen in Figs. 1 and 2, and so that as the twist advances in the withdrawal there will be no disturbance of the sand at the head portion.

I have represented the mold-board as having a plate surrounding the twisted portion and through which the opening is made, and this is desirable, first, to prevent wear, and, second, because it must be necessarily thin, as seen in Fig. 4, so that the pattern may be turned beneath it in withdrawing from the flask. After the pattern has thus been removed from the mold by a combined rotative and longitudinal movement, the flask is removed from the board in the usual manner. Then the pattern is returned by a reverse rotative movement, and which, because of the combined action of the convolutions of the twist with the openings in the board, brings the pattern again to its proper position on the board.

\Vhile myinvention is designed with special reference to molding angers, it will be understood that the same invention is applicable to molding various articles in which there is a regular twist or succession of convolutions.

From the foregoing it will be understood that I do not claim, broadly, a mold-board having a pattern arranged upon an axis thereon over an opening, and so that the pattern may be turned below the board through the opening by rotative movement upon its axis.

I claim- 1. The herein-described improvement in apparatus for making molds for casting angers or like twisted articles, consisting in a pattern corresponding to one-half the twist to be produced, the division being in a longitudinal central plane, combined with a moldboard constructed with an opening through it corresponding to the convolntions of the pattern in the plane of said division in the twisted pattern,the said twisted pattern arranged upon an axis in the plane of the surface of said board, and the convolutions of the pattern being over the corresponding parts of said opening, and means, substantially such as described, to impart rotation to said pattern, and whereby, under the rotation of the said pattern downward through the said opening, it will be caused to move longitudinally according to its own convolntions, substantially as specified.

2. The combination ofa pattern corresponding to one-half an anger, the division being in a longitudinal central plane and the twisted portion being separate from the shank and head portion, a mold-hoard having said shank and head portions fixed thereto, an opening through the mold-board corresponding to the plane of the said division in the twisted portion, and a spindle arranged in axial line with the said pattern and having the twist portion fixed thereto, the said spindle and twist portion beingadapted to be rotated, substantially as-described, whereby by such rotation the pattern may be exposed above the board or passed through said opening to a position beneath the board, substantially as described.

enonen F. STEARNS.

Witnesses:

J. H. SHUMWAY, FRED O. EARLE. 

